Raedwulf--

I'm not seeking agreement. It's not my opinion; I am conveying how a certain people or culture conceptualize their world.

The mistake, in my opinion, would be to fail to acknowledge that with the culturally constructed concept of "music" (as opposed to the universal or scientific object, sound) one will find variation in these ideas about who is a "musician." In some cases, the concept of musician may not exist at all. And it would be a mistake to treat this as merely a pedant issue since, as I have demonstrated by example, a society's view of individuals in relation to "music" affects a host of other issues of value, status, and meaning.